I've encoded 11 FLAC files with FLAC Frontend. I've tagged them (without album cover), but I kept a copy of the untagged files.When I compare their size, the tagged files and the non-tagged files have the exactly same size (in bytes).(This changes of course if I add the album cover to the files.)

So why is that that add data to the file doesn't seem to make the file bigger ?I guess I've used the standard tag files and maybe they have their place reserved even when they are empty ? Or something like that ?